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H. E. WAITE.

TELEPHONE TRANSMITTER.

(No Model.)

Patented Feb. 17, 1885.

5 H m ulumu llllormry WITNESSES sure firarns HENRY E. VVAITE, OF NEWYORK, N. Y.

TELEPHONE-TRANSMITTER.

SPECIFICATION forming part of Letters Patent No. 312,409, dated February17, 1885.

Application filed February 2, 1884. (N0 model.)

To all whom it may concern Be it known that I, HENRY E. \VAITE, of NewYork, county of New York, and State of New -York, have invented a newand useful Improvement in Telephone 'lransmitters, of which thefollowing is a full, clear, and exact description, reference being hadto the accompanying drawings, making part of this specification.

My invent-ion relates to telephonetransmitters, and has for its objectto improve and simplify their construction and render their operationand regulation more perfect and simple; and my invention consists in atelephone and parts thereof constructed and an ranged substantially ashereinafter specified.

In the accompanying drawings, forming part of this specification, Figurel is a vertical section through a transmitter embodying my improvements,with a diagram showing the arrangement of a circuit including amagnetoreceiver. Fig. 2 is a similar view showing a modification in someof the details of construction.

My improvements are shown as applied to what is known as a boxtransmitter, in which one side of the box has an opening forming theusual mouth-piece. and behind which opening the diaphragm is supported,

the current-varying devices being behind the diaphragm and protected bythe other sides of the box.

In the drawings, A represents such a box having an opening. a, in itsfront wall or side. In-the drawings 1 have shown fitting behind thiswall a plate, a, also having an opening concentric with the opening inthe front wall, A, and the diaphragm B is supported in a recess or ledgeformed around this opening. This plate may be dispensed with and thediaphragm supported in the front wall in a similar'manner. The diaphragmB is preferably made of a thin plate or disk, of wood, bone, ivory, orother similar non-conducting material, and may be supported in therecess or ledge upon a cushion or ring, I), of rubber or cork,interposed between the ledge and diaphragm, as shown in Fig. 2.

Some means must be provided to hold the diaphragm in position on theledge, and this I accomplish by a spring, (3, rigidly secured to theplate A at one side of the opening, the other end of the bent springpreferably bearing upon the diaphragm at or near its center.

The spring thus ar *anged not only holds the k diaphragm in position,but acts as a damper to influence the vibrations of the diaphragm, andit may be further utilized to form a support for one of the electrodesThus in the drawings the electrode 0. of carbon or similar material, issupported on the inner side of the free end of the spring C. The otherelectrode, d, which is of any desired material, as platinum or carbon,is supported upon a spring, D, one end of which is secured to the plateA outside of the diaphragm, and the spring being so formed as to tend tohold the electrodes out of contact. A screw, 6, is provided which passesthrough the spring and is secured to the plate or frame, and is used toadjust and regulate the initial contact between the electrodes 0 d.

The diagram shown in Fig. 1 represents one way of connecting up myimproved transmitter with a battery-circuit and magneto-receiver.

Various ways of attaching the carbon buttons or electrodes have beenused, but I have found the following to be a very effective and simpleway, and that electrodes so I made and connected will wear a long timewithout deterioration and the electrical contact will be perfectlymaintained.

The carbon button is first subjected to an electroplating bath andcovered in whole or in part with a thin coating of copper or othersimilar material in a well-know way. If the entire button is plated, Iremove the plating at the point of contact with the other electrode; orthe plating may be applied to parts only of the button by stopping outsuch other parts, as is well known. The button is then secured to thesupporting-spring by soldering, the electroplating forming a goodconnecting medium, both mechanically and electrically, 5

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in said recess, a spring-finger secured to said free end bearing uponand supporting and plate and holding the diaphragm in position dampingthe diaphragm, and the other face and bearing upon its free end one ofthe eleccarrying an electrode, substantially as detrodes, and anadjustable spring, also secured scribed.

5 to the plate and supporting the other elec- Intestimonywhereoflhavehereunto set my I 5 trode in contact with thefirst, substantially hand this 31st day of January, A. D. 1884. asdescribed. HENRY E. XVAITE.

2. The combination, with a recessed plate, Vitnesses: of a diaphragm insaid recess and a spring- REX. M. SMITH, IO finger secured to saidplate, one face of its GEO. K. RUNIDEL.

